This page lists some common problems that users can have in trying to run CAM-chem.
(1) Build error - case name
Check if you included “--mach cheyenne” option when you created the new case
(2) Build error - freezing
The build will hang on the command:
Cancel the build and try the command
and if the same freeze occurs then the problem is most likely within the namelist definition file (
user_nl_cam). Make sure all the commas and quote marks are there. Sometimes, if the
user_nl_cam file has been opened in Notepad or another text editor, auto-formatting can change the formatting of some symbols, such as quote marks (e.g. Word automatically changes straight quote marks to curly quote marks).
(3) Build error - coupling definition
During the model build the following error occurs:
This occurs when using Python 3 rather than Python 2. Module load python2.7.X and clean build.
(4) Submit error - files missing
Cloning and creating a branch is complete but the following error occurs:
a) Check your restart files have been copied to the output run folder, and that they are the same date as the RUN_REFDATE
b) Make sure initialization files are not defined in the
user_nl_clm files (i.e. remove those lines if they are there).
(5) Run error - model crash due to MPT error
With a recent update to the MPT system on cheyenne during March 2019, the
specific.xml file needs to be updated. Otherwise you will be able to submit, but will find the simulation crashes with this error in the
To correct the error copy the file:
to your case directory, then reset and recompile.
(6) Run error - model crash due to dry deposition
This error occurs when you add a gas species and make it to be dry deposited by adding the species name into ‘drydep_list’ in ‘&drydep_inparm’, but you don’t modify seq_drydep_mod.F90. See instructions on https://wiki.ucar.edu/display/camchem/Updating+Gas-Phase+Chemistry
(7) Run error - model crash past 2016
To run past 2016 you will need to make sure the correct sea ice specification is called. Add to
and of course ensure all your emissions and meteorology files cover the dates you require.